Add ExtensionsApiClient interface, use it in the storage API SettingsFrontend

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 97 matching lines @@
         'browser/extensions/activity_log/fullstream_ui_policy.h',
         'browser/extensions/activity_log/uma_policy.cc',
         'browser/extensions/activity_log/uma_policy.h',
         'browser/extensions/activity_log/web_request_constants.cc',
         'browser/extensions/activity_log/web_request_constants.h',
         'browser/extensions/api/activity_log_private/activity_log_private_api.cc',
         'browser/extensions/api/activity_log_private/activity_log_private_api.h',
         'browser/extensions/api/api_resource.cc',
         'browser/extensions/api/api_resource.h',
         'browser/extensions/api/api_resource_manager.h',
+        'browser/extensions/api/chrome_extensions_api_client.cc',
+        'browser/extensions/api/chrome_extensions_api_client.h',
         'browser/extensions/api/alarms/alarm_manager.cc',
         'browser/extensions/api/alarms/alarm_manager.h',
         'browser/extensions/api/alarms/alarms_api.cc',
         'browser/extensions/api/alarms/alarms_api.h',
         'browser/extensions/api/app_current_window_internal/app_current_window_internal_api.cc',
         'browser/extensions/api/app_current_window_internal/app_current_window_internal_api.h',
         'browser/extensions/api/app_runtime/app_runtime_api.cc',
         'browser/extensions/api/app_runtime/app_runtime_api.h',
         'browser/extensions/api/app_window/app_window_api.cc',
         'browser/extensions/api/app_window/app_window_api.h',
@@ skipping 377 matching lines @@
         'browser/extensions/api/storage/managed_value_store_cache.cc',
         'browser/extensions/api/storage/managed_value_store_cache.h',
         'browser/extensions/api/storage/policy_value_store.cc',
         'browser/extensions/api/storage/policy_value_store.h',
         'browser/extensions/api/storage/setting_sync_data.cc',
         'browser/extensions/api/storage/setting_sync_data.h',
         'browser/extensions/api/storage/settings_backend.cc',
         'browser/extensions/api/storage/settings_backend.h',
         'browser/extensions/api/storage/settings_frontend.cc',
         'browser/extensions/api/storage/settings_frontend.h',
-        'browser/extensions/api/storage/settings_namespace.cc',
-        'browser/extensions/api/storage/settings_namespace.h',
         'browser/extensions/api/storage/settings_observer.h',
         'browser/extensions/api/storage/settings_storage_factory.h',
         'browser/extensions/api/storage/settings_storage_quota_enforcer.cc',
         'browser/extensions/api/storage/settings_storage_quota_enforcer.h',
         'browser/extensions/api/storage/settings_sync_processor.cc',
         'browser/extensions/api/storage/settings_sync_processor.h',
         'browser/extensions/api/storage/settings_sync_util.cc',
         'browser/extensions/api/storage/settings_sync_util.h',
         'browser/extensions/api/storage/storage_api.cc',
         'browser/extensions/api/storage/storage_api.h',
@@ skipping 709 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/chromeos/contacts',
             'proto_out_dir': 'chrome/browser/chromeos/contacts',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],  # 'chromeos=1'
   ],  # 'conditions'
 }